Hostname: page-component-586b7cd67f-g8jcs Total loading time: 0 Render date: 2024-11-24T21:43:45.301Z Has data issue: false hasContentIssue false
  • English
  • Français

Effect of Monazite Coating on Tensile Properties of Nextel 720 Fibers, Tows and Minicomposites

Published online by Cambridge University Press:  01 February 2011

Devdas M. Pai ,
Sergey Yarmolenko ,
Jagannathan Sankar ,
Balasubramanian Kailasshankar ,
Christopher Murphy ,
Edwardo Freeman  and
Larry P. Zawada
Devdas M. Pai
Affiliation:
Center for Advanced Materials and Smart Structures, North Carolina A&T State University, Greensboro, NC 27411, U.S.A.
Sergey Yarmolenko
Affiliation:
Center for Advanced Materials and Smart Structures, North Carolina A&T State University, Greensboro, NC 27411, U.S.A.
Jagannathan Sankar
Affiliation:
Center for Advanced Materials and Smart Structures, North Carolina A&T State University, Greensboro, NC 27411, U.S.A.
Balasubramanian Kailasshankar
Affiliation:
Center for Advanced Materials and Smart Structures, North Carolina A&T State University, Greensboro, NC 27411, U.S.A.
Christopher Murphy
Affiliation:
Center for Advanced Materials and Smart Structures, North Carolina A&T State University, Greensboro, NC 27411, U.S.A.
Edwardo Freeman
Affiliation:
Center for Advanced Materials and Smart Structures, North Carolina A&T State University, Greensboro, NC 27411, U.S.A.
Larry P. Zawada
Affiliation:
Metals, Ceramics and NDE Division (AFRL/MLLN), Air Force Research Laboratory, Wright-Patterson Air Force Base, OH 45433, U.S.A.
Get access

Abstract

The tensile strengths of Nextel™ 720 fibers as well as tows and minicomposites made of these fibers were measured to study the effects of monazite coating at room temperature (RT) and 1200°C (HT). Tests were conducted on as-received materials (called unsoaked) as well as materials that had been thermally soaked at HT for 100 hours. Weibull analysis of fiber strength data shows close agreement between the Weibull modulus obtained from the statistical fracture distribution and the modulus obtained from a study of the gage length dependence of strength. The monazite coating does not change the RT strength of unsoaked single fibers, but has a beneficial effect in terms of strength retention under HT testing. This beneficial effect of the coating disappears for soaked samples. The results for tows and minicomposites also indicate that for the unsoaked condition, tensile failure appears to be driven by fiber surface flaws and the presence of the monazite coatings clearly improves both RT and HT strength of fibers, tows and minicomposites. However, the beneficial effects of the coating disappear after long term exposure to HT.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 795: Symposium U – Thin Films - Stresses and Mechanical Properties X , 2003 , U11.43
Copyright
Copyright © Materials Research Society 2004

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Evans, A. G. and Zok, F. W., Journal of Materials Science, 29, 3857–3896 (1994).Google Scholar
2. Sun, E. Y., Lin, H.-T. and Brennan, J. J., Journal of the American Ceramic Society, 80, 609–614 (1997).Google Scholar
3. Morgan, P. E. D., and Marshall, D. B., Journal of the American Ceramic Society, 78, 1553–1563 (1995).Google Scholar
4. Marshall, D. B., Morgan, P. E. D., Housley, R. M., and Cheung, J. T., Journal of the American Ceramic Society, 81, 951–956 (1998).Google Scholar
5. Wilson, D. M. and Visser, L. R., Composites: Part A, 32, 1143–1153 (2000).Google Scholar
6. Boakye, E., Hay, R. S., and Petry, M. D., Journal of the American Ceramic Society, 82, 2321–31 (1999).Google Scholar
7. Boakye, E., Petry, M. D., Hay, R. S., and Douglas, L. M., Ceramics Engineering and Science, 21, 229–236 (2000).Google Scholar
8. Hay, R. S., Boakye, E. and Petry, M. D., Journal of the European Ceramic Society, 20, 589–597 (2000).Google Scholar
9. Pai, D., Yarmolenko, S., Kailasshankar, B., Sankar, J., Lua, J. and Zawada, L., Proceedings of the 2002 ASME IMECE, New Orleans, LA, Paper #IMECE2002–39372 (2002).Google Scholar
10. ASTM C 1239–95, Standard Practice for Reporting Uniaxial Strength Data and Estimating Weibull Distribution Parameters for Advanced Ceramics, American Society for Testing and Materials, Philadelphia, PA (1995).Google Scholar